RCW 46.37.524

Motor-driven cycles—Head lamps.

The head lamp or head lamps upon every motor-driven cycle may be of the single-beam or multiple-beam type but in either event shall comply with the requirements and limitations as follows:

(1) Every such head lamp or head lamps on a motor-driven cycle shall be of a sufficient intensity to reveal a person or a vehicle at a distance of not less than one hundred feet when the motor-driven cycle is operated at any speed less than twenty-five miles per hour and at a distance of not less than two hundred feet when the motor-driven cycle is operated at a speed of twenty-five or more miles per hour, and at a distance of not less than three hundred feet when the motor-driven cycle is operated at a speed of thirty-five or more miles per hour;

(2) In the event the motor-driven cycle is equipped with a multiple-beam head lamp or head lamps the upper beam shall meet the minimum requirements set forth above and shall not exceed the limitations set forth in RCW 46.37.220(1), and the lowermost beam shall meet the requirements applicable to a lowermost distribution of light as set forth in RCW 46.37.220;

(3) In the event the motor-driven cycle is equipped with a single-beam lamp or lamps, such lamp or lamps shall be so aimed that when the vehicle is loaded none of the high-intensity portion of light, at a distance of twenty-five feet ahead, shall project higher than the level of the center of the lamp from which it comes.